Symfony 6.3.10 has just been released.
Here is the list of the most important changes since 6.3.9:

bug #52804 [Serializer] Fix support of plain object types denormalization (@andersonamuller)
bug #52845 [Routing] Restore aliases removal in RouteCollection::remove() (@fancyweb)
bug #52846 [PhpUnitBridge] run composer update for compatibility with PHPUnit versions shipping composer.lock (@xabbuh)
bug #52823 add parameter types in query builder (@javiercno)
bug #52808 [DependencyInjection] Fix dumping containers with null-referenced services (@nicolas-grekas)
bug #52797 [VarExporter] Fix lazy ghost trait when using nullsafe operator (@nicolas-grekas)
bug #52806 [Routing] Fix removing aliases pointing to removed route in RouteCollection::remove() (@fancyweb)

Want to upgrade to this new release? Because Symfony protects
backwards-compatibility very closely, this should be quite easy. Use
SymfonyInsight upgrade reports
to detect the code you will need to change in your project and
read our upgrade
documentation to learn more.

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